/usr/lib/python2.7/dist-packages/pexpect/screen.py is in python-pexpect 4.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 | '''This implements a virtual screen. This is used to support ANSI terminal
emulation. The screen representation and state is implemented in this class.
Most of the methods are inspired by ANSI screen control codes. The
:class:`~pexpect.ANSI.ANSI` class extends this class to add parsing of ANSI
escape codes.
PEXPECT LICENSE
This license is approved by the OSI and FSF as GPL-compatible.
http://opensource.org/licenses/isc-license.txt
Copyright (c) 2012, Noah Spurrier <noah@noah.org>
PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
'''
import codecs
import copy
import sys
import warnings
warnings.warn(("pexpect.screen and pexpect.ANSI are deprecated. "
"We recommend using pyte to emulate a terminal screen: "
"https://pypi.python.org/pypi/pyte"),
stacklevel=2)
NUL = 0 # Fill character; ignored on input.
ENQ = 5 # Transmit answerback message.
BEL = 7 # Ring the bell.
BS = 8 # Move cursor left.
HT = 9 # Move cursor to next tab stop.
LF = 10 # Line feed.
VT = 11 # Same as LF.
FF = 12 # Same as LF.
CR = 13 # Move cursor to left margin or newline.
SO = 14 # Invoke G1 character set.
SI = 15 # Invoke G0 character set.
XON = 17 # Resume transmission.
XOFF = 19 # Halt transmission.
CAN = 24 # Cancel escape sequence.
SUB = 26 # Same as CAN.
ESC = 27 # Introduce a control sequence.
DEL = 127 # Fill character; ignored on input.
SPACE = u' ' # Space or blank character.
PY3 = (sys.version_info[0] >= 3)
if PY3:
unicode = str
def constrain (n, min, max):
'''This returns a number, n constrained to the min and max bounds. '''
if n < min:
return min
if n > max:
return max
return n
class screen:
'''This object maintains the state of a virtual text screen as a
rectangluar array. This maintains a virtual cursor position and handles
scrolling as characters are added. This supports most of the methods needed
by an ANSI text screen. Row and column indexes are 1-based (not zero-based,
like arrays).
Characters are represented internally using unicode. Methods that accept
input characters, when passed 'bytes' (which in Python 2 is equivalent to
'str'), convert them from the encoding specified in the 'encoding'
parameter to the constructor. Methods that return screen contents return
unicode strings, with the exception of __str__() under Python 2. Passing
``encoding=None`` limits the API to only accept unicode input, so passing
bytes in will raise :exc:`TypeError`.
'''
def __init__(self, r=24, c=80, encoding='latin-1', encoding_errors='replace'):
'''This initializes a blank screen of the given dimensions.'''
self.rows = r
self.cols = c
self.encoding = encoding
self.encoding_errors = encoding_errors
if encoding is not None:
self.decoder = codecs.getincrementaldecoder(encoding)(encoding_errors)
else:
self.decoder = None
self.cur_r = 1
self.cur_c = 1
self.cur_saved_r = 1
self.cur_saved_c = 1
self.scroll_row_start = 1
self.scroll_row_end = self.rows
self.w = [ [SPACE] * self.cols for _ in range(self.rows)]
def _decode(self, s):
'''This converts from the external coding system (as passed to
the constructor) to the internal one (unicode). '''
if self.decoder is not None:
return self.decoder.decode(s)
else:
raise TypeError("This screen was constructed with encoding=None, "
"so it does not handle bytes.")
def _unicode(self):
'''This returns a printable representation of the screen as a unicode
string (which, under Python 3.x, is the same as 'str'). The end of each
screen line is terminated by a newline.'''
return u'\n'.join ([ u''.join(c) for c in self.w ])
if PY3:
__str__ = _unicode
else:
__unicode__ = _unicode
def __str__(self):
'''This returns a printable representation of the screen. The end of
each screen line is terminated by a newline. '''
encoding = self.encoding or 'ascii'
return self._unicode().encode(encoding, 'replace')
def dump (self):
'''This returns a copy of the screen as a unicode string. This is similar to
__str__/__unicode__ except that lines are not terminated with line
feeds.'''
return u''.join ([ u''.join(c) for c in self.w ])
def pretty (self):
'''This returns a copy of the screen as a unicode string with an ASCII
text box around the screen border. This is similar to
__str__/__unicode__ except that it adds a box.'''
top_bot = u'+' + u'-'*self.cols + u'+\n'
return top_bot + u'\n'.join([u'|'+line+u'|' for line in unicode(self).split(u'\n')]) + u'\n' + top_bot
def fill (self, ch=SPACE):
if isinstance(ch, bytes):
ch = self._decode(ch)
self.fill_region (1,1,self.rows,self.cols, ch)
def fill_region (self, rs,cs, re,ce, ch=SPACE):
if isinstance(ch, bytes):
ch = self._decode(ch)
rs = constrain (rs, 1, self.rows)
re = constrain (re, 1, self.rows)
cs = constrain (cs, 1, self.cols)
ce = constrain (ce, 1, self.cols)
if rs > re:
rs, re = re, rs
if cs > ce:
cs, ce = ce, cs
for r in range (rs, re+1):
for c in range (cs, ce + 1):
self.put_abs (r,c,ch)
def cr (self):
'''This moves the cursor to the beginning (col 1) of the current row.
'''
self.cursor_home (self.cur_r, 1)
def lf (self):
'''This moves the cursor down with scrolling.
'''
old_r = self.cur_r
self.cursor_down()
if old_r == self.cur_r:
self.scroll_up ()
self.erase_line()
def crlf (self):
'''This advances the cursor with CRLF properties.
The cursor will line wrap and the screen may scroll.
'''
self.cr ()
self.lf ()
def newline (self):
'''This is an alias for crlf().
'''
self.crlf()
def put_abs (self, r, c, ch):
'''Screen array starts at 1 index.'''
r = constrain (r, 1, self.rows)
c = constrain (c, 1, self.cols)
if isinstance(ch, bytes):
ch = self._decode(ch)[0]
else:
ch = ch[0]
self.w[r-1][c-1] = ch
def put (self, ch):
'''This puts a characters at the current cursor position.
'''
if isinstance(ch, bytes):
ch = self._decode(ch)
self.put_abs (self.cur_r, self.cur_c, ch)
def insert_abs (self, r, c, ch):
'''This inserts a character at (r,c). Everything under
and to the right is shifted right one character.
The last character of the line is lost.
'''
if isinstance(ch, bytes):
ch = self._decode(ch)
r = constrain (r, 1, self.rows)
c = constrain (c, 1, self.cols)
for ci in range (self.cols, c, -1):
self.put_abs (r,ci, self.get_abs(r,ci-1))
self.put_abs (r,c,ch)
def insert (self, ch):
if isinstance(ch, bytes):
ch = self._decode(ch)
self.insert_abs (self.cur_r, self.cur_c, ch)
def get_abs (self, r, c):
r = constrain (r, 1, self.rows)
c = constrain (c, 1, self.cols)
return self.w[r-1][c-1]
def get (self):
self.get_abs (self.cur_r, self.cur_c)
def get_region (self, rs,cs, re,ce):
'''This returns a list of lines representing the region.
'''
rs = constrain (rs, 1, self.rows)
re = constrain (re, 1, self.rows)
cs = constrain (cs, 1, self.cols)
ce = constrain (ce, 1, self.cols)
if rs > re:
rs, re = re, rs
if cs > ce:
cs, ce = ce, cs
sc = []
for r in range (rs, re+1):
line = u''
for c in range (cs, ce + 1):
ch = self.get_abs (r,c)
line = line + ch
sc.append (line)
return sc
def cursor_constrain (self):
'''This keeps the cursor within the screen area.
'''
self.cur_r = constrain (self.cur_r, 1, self.rows)
self.cur_c = constrain (self.cur_c, 1, self.cols)
def cursor_home (self, r=1, c=1): # <ESC>[{ROW};{COLUMN}H
self.cur_r = r
self.cur_c = c
self.cursor_constrain ()
def cursor_back (self,count=1): # <ESC>[{COUNT}D (not confused with down)
self.cur_c = self.cur_c - count
self.cursor_constrain ()
def cursor_down (self,count=1): # <ESC>[{COUNT}B (not confused with back)
self.cur_r = self.cur_r + count
self.cursor_constrain ()
def cursor_forward (self,count=1): # <ESC>[{COUNT}C
self.cur_c = self.cur_c + count
self.cursor_constrain ()
def cursor_up (self,count=1): # <ESC>[{COUNT}A
self.cur_r = self.cur_r - count
self.cursor_constrain ()
def cursor_up_reverse (self): # <ESC> M (called RI -- Reverse Index)
old_r = self.cur_r
self.cursor_up()
if old_r == self.cur_r:
self.scroll_up()
def cursor_force_position (self, r, c): # <ESC>[{ROW};{COLUMN}f
'''Identical to Cursor Home.'''
self.cursor_home (r, c)
def cursor_save (self): # <ESC>[s
'''Save current cursor position.'''
self.cursor_save_attrs()
def cursor_unsave (self): # <ESC>[u
'''Restores cursor position after a Save Cursor.'''
self.cursor_restore_attrs()
def cursor_save_attrs (self): # <ESC>7
'''Save current cursor position.'''
self.cur_saved_r = self.cur_r
self.cur_saved_c = self.cur_c
def cursor_restore_attrs (self): # <ESC>8
'''Restores cursor position after a Save Cursor.'''
self.cursor_home (self.cur_saved_r, self.cur_saved_c)
def scroll_constrain (self):
'''This keeps the scroll region within the screen region.'''
if self.scroll_row_start <= 0:
self.scroll_row_start = 1
if self.scroll_row_end > self.rows:
self.scroll_row_end = self.rows
def scroll_screen (self): # <ESC>[r
'''Enable scrolling for entire display.'''
self.scroll_row_start = 1
self.scroll_row_end = self.rows
def scroll_screen_rows (self, rs, re): # <ESC>[{start};{end}r
'''Enable scrolling from row {start} to row {end}.'''
self.scroll_row_start = rs
self.scroll_row_end = re
self.scroll_constrain()
def scroll_down (self): # <ESC>D
'''Scroll display down one line.'''
# Screen is indexed from 1, but arrays are indexed from 0.
s = self.scroll_row_start - 1
e = self.scroll_row_end - 1
self.w[s+1:e+1] = copy.deepcopy(self.w[s:e])
def scroll_up (self): # <ESC>M
'''Scroll display up one line.'''
# Screen is indexed from 1, but arrays are indexed from 0.
s = self.scroll_row_start - 1
e = self.scroll_row_end - 1
self.w[s:e] = copy.deepcopy(self.w[s+1:e+1])
def erase_end_of_line (self): # <ESC>[0K -or- <ESC>[K
'''Erases from the current cursor position to the end of the current
line.'''
self.fill_region (self.cur_r, self.cur_c, self.cur_r, self.cols)
def erase_start_of_line (self): # <ESC>[1K
'''Erases from the current cursor position to the start of the current
line.'''
self.fill_region (self.cur_r, 1, self.cur_r, self.cur_c)
def erase_line (self): # <ESC>[2K
'''Erases the entire current line.'''
self.fill_region (self.cur_r, 1, self.cur_r, self.cols)
def erase_down (self): # <ESC>[0J -or- <ESC>[J
'''Erases the screen from the current line down to the bottom of the
screen.'''
self.erase_end_of_line ()
self.fill_region (self.cur_r + 1, 1, self.rows, self.cols)
def erase_up (self): # <ESC>[1J
'''Erases the screen from the current line up to the top of the
screen.'''
self.erase_start_of_line ()
self.fill_region (self.cur_r-1, 1, 1, self.cols)
def erase_screen (self): # <ESC>[2J
'''Erases the screen with the background color.'''
self.fill ()
def set_tab (self): # <ESC>H
'''Sets a tab at the current position.'''
pass
def clear_tab (self): # <ESC>[g
'''Clears tab at the current position.'''
pass
def clear_all_tabs (self): # <ESC>[3g
'''Clears all tabs.'''
pass
# Insert line Esc [ Pn L
# Delete line Esc [ Pn M
# Delete character Esc [ Pn P
# Scrolling region Esc [ Pn(top);Pn(bot) r
|